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研究Al-Cu-Mg-Ag合金系AA2139合金在T6和T840条件下的高周疲劳行为。T840处理是在峰时效前进行压下量为40%的冷轧。与T6态相比,T840可提高合金的拉伸强度。但是两种条件下的疲劳寿命基本相同,因为热力加工过程对裂纹的萌生和扩展的影响较小。
The high cycle fatigue behavior of Al-Cu-Mg-Ag alloy AA2139 alloy under T6 and T840 conditions was studied. The T840 treatment was cold rolling with a reduction of 40% before peak aging. Compared with the T6 state, T840 can improve the tensile strength of the alloy. However, the fatigue life under the two conditions is basically the same, because thermal processing has little effect on the initiation and propagation of cracks.